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All mods that add a bonus of the same type have their bonus added together. For example, if a weapon has Serration giving +165% damage and Heavy Caliber also giving +165% damage, it will receive a total of +330% damage.

This is true of all bonuses, not just damage. Combining Speed Trigger (+60% Fire Rate) and Shred (+30% Fire Rate, +1.2 Punchthrough) will give a total of +90% Fire Rate.

When calculating damage, first base damage bonuses are added together and applied. For example, the Karak has a base damage of 27. Equipping a max rank Serration (+165% base damage) adds 1.65 * 27 = 44.55 additional damage for a total of 71.55 damage. The added damage will be of the same type(s) the weapon innately deals.

Then, all elemental and physical damage boni are calculated based on the modified base damage. For example, adding a Hellfire (+90% Heat damage) to a Karak that already has Serration equipped will add 90% of 71.55 for a total of 64.4 Heat damage. This damage is added to the base, and the Karak now deals a total of 135.95 damage if you add together all damage types.

After that, faction damage boni are applied to all damage types. A Karak equipped with Serration, Hellfire, and Bane of Corpus (+30% damage against Corpus) will deal an extra .3 * 71.55 = 21.47 physical damage and an extra .3 * 64.4 = 19.32 Heat damage for a total of 176.74 damage of all types.

For weapons that fire multiple projectiles like Shotguns or Cernos Prime, this damage is split evenly across all projectiles to get the base damage per projectile. If the weapon only fires one projectile at a time, all of the damage is the base damage per projectile.

If the weapon has Multishot from a mod like Split Chamber, it will fire additional projectiles, each of which will deal the base damage per projectile. For weapons that only fire a single projectile, Split Chamber's 90% multishot will cause each shot to randomly have a 90% chance to fire two projectiles instead of one. Since Cernos Prime already fires 3 arrows per shot, adding Split Chamber will make it fire 3 * .9 = 2.7 additional arrows, so each shot will fire at least 5 arrows, and 70% of shots will fire 6.

On continuous beam weapons like the Glaxion, the damage of the beam simply has the multishot chance added. For example, adding Split Chamber to a Glaxion will act as an additional 90% total damage bonus.

Once damage is calculated, it may be affected on impact by Critical Hit mechanics or modified based on the opponent's armor. For detailed calculations of how various damage types affect different types of enemies, see the Damage page.

Physical damage mods apply only to base damage of the same type. For example, at max rank Fanged Fusillade increases Slash damage by +120%. The Karak does 27 damage split into 12.15 Impact, 8.1 Puncture, and 6.75 Slash. A Karak equipped a max rank Fanged Fusillade will gain (6.75 * 1.2) = 8.1 additional Slash damage for a total of 14.85 Slash and 35.1 total damage.

If a Physical damage mod is added to a weapon that does no physical damage of the corresponding type, the mod will have no effect. For example, the Amprex does entirely Electric damage when unmodded, so Fanged Fusillade will do absolutely nothing.

Elemental damage mods apply to all damage done by a weapon. For example, a max rank Hellfire adds 90% Heat damage to a rifle. If a Karak was equipped with a max rank Hellfire, it would gain 27 * .9 = 24.3 Heat damage.

Each two different elemental mods will be added up into a Combined Element, with different damage multipliers against certain enemies. For combined elements, the slots are ordered from left to right, top row then bottom row, with any inherent elemental damage (from the weapon) added last. For example, if both Hellfire (+Heat damage) and Cryo Rounds (+Cold damage) are equipped on an Amprex, they will combine to add Blast damage to the weapon's base Electric damage. If only Hellfire is used, it will combine with the Amprex's base Electric damage to make Radiation damage instead.

If multiple mods of the same element are added, only the first is used when making combinations. For example, if Hellfire, Cryo Rounds, and Thermite Rounds are added to an Amprex, no matter what the order is the weapon will deal Blast and Electric damage since the Heat element has already combined with Cold, so the second Heat mod simply increases the amount of Blast damage dealt.

Both Physical and Elemental damage are combined in the same step and are based only on the weapon's base damage and any mods that effect base damage.

In terms of raw damage, this makes a +90% Heat damage bonus superior to +90% Slash damage bonus unless the weapon deals all of its damage as Slash. In terms of actual impact, the total effect varies based on the armor type of enemy being damaged.